US6058927A - Method and device for achieving easy movement of a cooking hob gas burner - Google Patents

Method and device for achieving easy movement of a cooking hob gas burner Download PDF

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Publication number
US6058927A
US6058927A US08/571,418 US57141895A US6058927A US 6058927 A US6058927 A US 6058927A US 57141895 A US57141895 A US 57141895A US 6058927 A US6058927 A US 6058927A
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US
United States
Prior art keywords
heating element
cavity
burner
magnetic force
cooking hob
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
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US08/571,418
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English (en)
Inventor
Marco Maritan
Cesare Antonio Bocchiola
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Whirlpool Europe BV
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Whirlpool Europe BV
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Assigned to WHIRLPOOL EUROPE B.V., (A COMPANY OF THE KINGDOM OF THE NETHERLANDS) reassignment WHIRLPOOL EUROPE B.V., (A COMPANY OF THE KINGDOM OF THE NETHERLANDS) ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BOCCHIOLA, CESARE, MARITAN, MARCO
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C3/00—Stoves or ranges for gaseous fuels
    • F24C3/12—Arrangement or mounting of control or safety devices
    • F24C3/126—Arrangement or mounting of control or safety devices on ranges
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C3/00—Stoves or ranges for gaseous fuels
    • F24C3/08—Arrangement or mounting of burners
    • F24C3/085—Arrangement or mounting of burners on ranges

Definitions

  • This invention relates to a method and device to move a heating element within a cavity of a cooking hob.
  • the heating element is within the cavity when not in use and partially emerges for activation.
  • heating elements such as gas burners
  • burners can assume two working positions. In a first of these positions the heating elements are retracted inside a corresponding cavity provided in the cooking hob so the top of each burner is substantially coplanar with the upper surface of the cooking hob. This makes it possible to rapidly clean said surface while at the same time provide the hob with a very attractive appearance. In the other position the burners project from the relative cavity above the cooking hob so that they can be activated and used. In the known art, the movement of each burner is achieved either by motorized mechanisms or by purely mechanical systems.
  • An object of the present invention is to provide a method (and a device for its implementation) which enables reliable movement of cooking hob burners to be achieved even after many years of use.
  • the invention provides said movement to be obtained in a simple and reliable manner by mechanisms which can be easily manufactured at low cost and in an industrial production.
  • FIG. 1 is a schematic cross-section through a cooking hob portion provided with a movable burner and the device according to the invention
  • FIG. 2 is a view analogous to FIG. 1, showing a modification of the device according to the invention
  • FIG. 3 is a view analogous to FIG. 1, but of a further modification of the invention.
  • FIG. 4 is a view analogous to FIG. 1, but of a further modification of the invention.
  • FIG. 5 is a view analogous to FIG. 1, but of a further modification of the invention.
  • FIG. 6 is a detailed view of a further modification of the invention.
  • a cooking hob 1 comprises at least one gas burner 2 freely movable within a corresponding seat or cavity 3 in said hob so as to be able to assume two working positions relative to the upper surface 4 of said hob. Namely a first position in which the burner is extended from the cavity 3 and projects above said surface, or another position (shown in the figures) in which the burner is retracted inside the corresponding cavity. In this latter case, the top 6 of the burner head 5 is substantially coplanar with the surface 4.
  • the burner 2 also comprises a body 8 with which there is associated in the usual manner, a gas feed conduit 10 of the type which allows the burner to move (for example of the partly bellows type).
  • the burner 2 can be moved within the cavity 3 by a magnetic force exerted between a fixed part associated with the cooking hob, and a part fixed to the movable burner.
  • the cavity 3 in which the burner 2 is positioned has an internal stepped configuration, with part 11 (the upper part in FIG. 1) close to the surface 4 being of greater diameter than the inner part 12.
  • a metal body 15 about which there is an electrical winding 16 associated with the wall 17 of the cavity 3.
  • This winding is connected to a power line 18 comprising a movable switch 19 operated in the usual manner by the knob 20.
  • Knob 20 also controls the gas feed to the burner 2.
  • the switch 19 closes following a rotary movement of the knob on activating the burner. Switch 19 closes when the knob is moved from its original "0" position, and remains in the closed state until the knob is returned to said "0" position. This is achieved by usual cam mechanisms or by activating a relay which causes the switch 19 to close.
  • the metal body 15 When a current I passes through the winding, the metal body 15 is magnetized and is able to cooperate with a permanent magnet 21 that is fixed to the burner body 8.
  • the magnet 21 can be formed either as an assembly of discrete parts or as a single annular body and is fixed to the body 8 in known manner, for example by adhesive.
  • the permanent magnet is preferably formed from rare earth materials; however, its choice depends on the burner weight and the geometrical configuration of the burner and of the cavity 3. This configuration and the magnet 21 are chosen such that only a weak magnetic attraction exists between the magnet and the body 15 when there is no current flowing through the winding 16.
  • the magnet 21 is positioned on the base surface 25 of the burner body 8.
  • the magnet is positioned annularly on the lateral wall 26 of the burner body 8.
  • the second arrangement is used in particular to prevent the development of a strong attractive force between the magnet 21 and the burner body 15.
  • the strong attractive force requires a strong magnetic field to be generated by the winding 16 for proper operation.
  • the strong magnetic field requires a high current passing through winding 16 or its number of turns to be increased (with obvious drawbacks), and an increase in the power dissipated by the winding due to the Joule heating effect.
  • the winding 16 is preferably embedded in a resin resistant to high temperature, to prevent spark generation should there be any breakage in its turns.
  • the cooking hob of FIGS. 1 and 2 is used as follows.
  • the burner When the burner is deactivated, it is in the position shown in the figures, i.e., it rests on the internal step 3A of the cavity 3.
  • the switch 19 closes and a current I passes through the winding 16. This generates a repulsive electromagnetic force between the body 15/winding 16 and the magnet 21, resulting in the movement (raising) of the burner 2 (arrow Y), which is extended from the cavity 3, so that the burner 2 can be activated in known manner.
  • the burner movement ceases when it reaches an equilibrium position in which the repulsive magnetic force equals the burner 2 weight.
  • Limit switches could be provided (not shown) to cooperate with the burner 2 when in its extended position.
  • FIG. 3 the parts corresponding to those of the already described figures are indicated by the same reference numerals.
  • a permanent magnet is not used and instead the burner movement is achieved by an electromagnet 30 comprising the winding 16 and two magnetic cores 31 and 32 (their illustrated shape being given merely by way of example), the first core 31 being fixed to the cooking hob and positioned within the cavity 3, and the second core 32 being positioned below the first and between core 31 and the cavity base 14.
  • Core 32 is associated with the burner body 8 by pins 35 inserted through seats 36 provided in the magnetic core 31.
  • the winding 16 is positioned centrally within the cavity 3 and is connected to the electrical line 18. During use, when the switch 19 is closed (in the same manner as described with reference to FIGS.
  • the current I passes through the turns of the winding 16 with the result that a magnetic field is produced to attract the (movable) core 32 to the (fixed) core 31.
  • the burner body 8 is fixed to the movable core 32 by pins 35, the burner moves to extend from the cavity 3.
  • the extent of travel of the burner depends on the distance between the cores 31 and 32 when the burner has retracted into the cavity 3.
  • the current intensity is chosen on the basis of the burner weight and the weight of the core 32 such as to achieve the total required movement.
  • FIG. 3 has a cost advantage over those of FIGS. 1 and 2 because it does not use permanent magnets.
  • FIG. 4 shows a further embodiment of the invention.
  • the burner body 8 is connected mechanically to a metal element 40 positioned on the lateral wall 26 of said body.
  • This element 40 supports a plurality of projecting poles 41.
  • the body 8 is positioned in the cavity 3, within the wall 17 on which there is positioned a second metal element 43 from which there project poles 44 (which when the burner has been inserted into the cavity 3 do not face the poles 41) about which the turns (connected in series) of the winding 16 are wound.
  • the knob 20 When the burner is activated, the knob 20 is operated to close the switch 19. As a result of this, current I passes through the turns of the winding 16 to generate a magnetic field which moves the body 8 until the poles 41 face the poles 44 (reducing the reluctance of the magnetic circuit).
  • the poles 41 and 44 By suitably dimensioning the poles 41 and 44, different extents of travel can be achieved for the burner, and burners of different weights and geometries can be moved.
  • FIG. 5 shows a further embodiment of the invention.
  • parts corresponding to those of the already described figures are indicated by the same reference numerals.
  • FIG. 5 shows an arrangement which is similar to that of FIG. 1, but with the difference that a permanent magnet 55 is provided (in place of the body 15 of FIG. 1) positioned on the base 14 of the cavity 3 in which the burner 2 moves.
  • the electrical winding 16 is interposed between magnet 55 and the magnet 21 that is fixed to the burner body 8.
  • the magnets 55 and 21 are arranged with like poles opposite each other (for example the north -N- of the magnet 55 facing the north -N- of the magnet 21).
  • the operating arrangement of FIG. 5 is less complex than the arrangement of FIG. 1.
  • the magnets 55 and 21 repel each other with a force that is less than the actual weight of the burner. Therefore, the burner remains retracted inside cavity 3 (as shown in FIG. 5).
  • an induced magnetic field is generated.
  • the magnetic field generates a force, which when added to the repulsive force between the magnets 55 and 21, enables the burner 2 to move and extend from the cavity 3 so burner 2 may be used.
  • FIG. 5 enables the electrical winding to be constructed with fewer turns than that of the arrangement of FIG. 1, and to use a current (for moving the burner) of less intensity. Therefore, there is less heat dissipation within the cavity 3, resulting in less heating of those regions of the hob 1 close to cavity 3, for the arrangement of FIG. 5.
  • FIG. 6 shows part of a further embodiment of the invention, which can also be applied to any of the arrangements already described in relation to the other figures.
  • the locking element 66 comprises a movable arm 67 arranged to cooperate with a seat 68 provided in the head 5 of the burner 2 to retain head 5 in the cavity 3.
  • This movable arm is, for example, activated in known manner by a bistable relay with which it is associated. This relay is controlled in a known manner by the knob which controls burner operation.
  • the arm 67 rotates about an axis P perpendicular to the hob 1 in such a manner as to be able to emerge towards the cavity 3 only when the burner head 5 is present within cavity 3 so that it becomes inserted in the seat 68 therein.
  • FIG. 6 enables the burner 2 to be retained within cavity 3 without the necessity of passing current through winding 16 for this purpose.
  • two or more elements 66 can be provided about the cavity 3 to achieve optimum locking of the burner 2.
  • the burner 2 can be moved:

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Gas Burners (AREA)
  • Baking, Grill, Roasting (AREA)
US08/571,418 1994-12-13 1995-12-13 Method and device for achieving easy movement of a cooking hob gas burner Expired - Fee Related US6058927A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI942505A IT1271259B (it) 1994-12-13 1994-12-13 Metodo e dispositivo per ottenere facile movimentazione di un bruciatore a gas di un piano di cottura
ITMI94A2505 1994-12-13

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US6058927A true US6058927A (en) 2000-05-09

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US08/571,418 Expired - Fee Related US6058927A (en) 1994-12-13 1995-12-13 Method and device for achieving easy movement of a cooking hob gas burner

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US (1) US6058927A (it)
EP (1) EP0717242A1 (it)
IT (1) IT1271259B (it)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080289617A1 (en) * 2004-07-13 2008-11-27 Fisher & Paykel Appliances Limited Gas Heating Appliance
US20090194720A1 (en) * 2004-12-29 2009-08-06 Jose Ignacio Mugica Control system for a gas cooking device
US9217571B1 (en) * 2012-06-11 2015-12-22 Burner Systems International, Inc. Burner head with magnetic burner cap connection

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2121477A (en) * 1937-12-14 1938-06-21 Dennis John Range burner mounting
US3169573A (en) * 1962-02-20 1965-02-16 Hidaka Manyoshi Vertical adjustment device for burners of gas-cookers
US4150664A (en) * 1976-09-03 1979-04-24 Trombatore Edward T Spatter screen for stove
GB1557641A (en) * 1978-05-16 1979-12-12 Ti Domestic Appliances Ltd Burner assembly
JPS57144364A (en) * 1981-02-27 1982-09-06 Matsutaka Chihogi Opening and closing device for gas valve closed automatically
EP0422564A2 (de) * 1989-10-10 1991-04-17 Bosch-Siemens HausgerÀ¤te GmbH Kochfeld mit gasbeheizten Brennstellen
FR2701542A1 (fr) * 1993-02-10 1994-08-19 Soremam Procédé et dispositif permettant de rendre, avec sécurité, un brûleur à gaz autoporteur escamotable par rapport à un plan de cuisson.

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2121477A (en) * 1937-12-14 1938-06-21 Dennis John Range burner mounting
US3169573A (en) * 1962-02-20 1965-02-16 Hidaka Manyoshi Vertical adjustment device for burners of gas-cookers
US4150664A (en) * 1976-09-03 1979-04-24 Trombatore Edward T Spatter screen for stove
GB1557641A (en) * 1978-05-16 1979-12-12 Ti Domestic Appliances Ltd Burner assembly
JPS57144364A (en) * 1981-02-27 1982-09-06 Matsutaka Chihogi Opening and closing device for gas valve closed automatically
EP0422564A2 (de) * 1989-10-10 1991-04-17 Bosch-Siemens HausgerÀ¤te GmbH Kochfeld mit gasbeheizten Brennstellen
FR2701542A1 (fr) * 1993-02-10 1994-08-19 Soremam Procédé et dispositif permettant de rendre, avec sécurité, un brûleur à gaz autoporteur escamotable par rapport à un plan de cuisson.

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080289617A1 (en) * 2004-07-13 2008-11-27 Fisher & Paykel Appliances Limited Gas Heating Appliance
US7895999B2 (en) 2004-07-13 2011-03-01 Fisher & Paykel Appliances Limited Cooking appliance
US8479721B2 (en) 2004-07-13 2013-07-09 Fisher & Paykel Appliances Limited Gas heating appliance
US20090194720A1 (en) * 2004-12-29 2009-08-06 Jose Ignacio Mugica Control system for a gas cooking device
US7637476B2 (en) * 2004-12-29 2009-12-29 Coprecitec, S.L. Control system for a gas cooking device
US9217571B1 (en) * 2012-06-11 2015-12-22 Burner Systems International, Inc. Burner head with magnetic burner cap connection

Also Published As

Publication number Publication date
IT1271259B (it) 1997-05-27
ITMI942505A0 (it) 1994-12-13
EP0717242A1 (en) 1996-06-19
ITMI942505A1 (it) 1996-06-13

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Effective date: 20040509

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Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362